Benthos: Crabs, Coral, and More

For an introductory college-level oceanography class. Review of some basic properties of crabs, corals, and other benthic marine organisms.
**This video comes near the end of the semester, so there may be terms with which the audience is unfamiliar. For a full playlist, refer to the Oceanography playlist on the Earth Rocks! RUclips Channel.
Content within this video is based on information available in any standard introductory college oceanography textbook, such as Essentials of Oceanography -- Trujillo and Thurman - Pearson Publishing.
Part of the Nekton & Benthos Series:
Part 1: Nekton: Whales, Fish, and More
Part 2: Benthos: Intertidal Zone
Part 3: Benthos: Crabs, Corals, and More
Part 4: Benthos: Deep Sea Vent & Seep Communities
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[@pukulu]

good one!
I know that some of the larger jellyfish depend entirely on their zooxanthellae for sustenance and no longer use their tentacles to catch prey. Perhaps their nematocysts have atrophied away?

[@alexandroskaminas]

pukulu nematocysts also have to do with defense so many jellyfish still have them even if they are sustained by photosynthesis